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Using the Pythagorean Theorem, we have:
a^2 + b^2 = c^2
6^2 + b^2 = 12^2
36 + b^2 = 144
b^2 = 108
b = √108
b ≈ 10.4 ft.
Therefore, the ladder will reach approximately 10.4 ft. in height.
The answer is:
○ 10.4 ft.